Layer order for line labels

[pli9]

With the current layer order for the line labels, they can potentially be hidden behind the dots and lines on the charts. Here is an example below:

dat <- data.frame(
  month = seq(as.Date('2024-01-01'), length.out = 24, by = "month"),
  den = rpois(24, lambda = 150)
)
dat$num <- sapply(dat$den, function(x) rbinom(1, x, 0.25))
controlcharts::spc(
  data = dat,
  numerators = num,
  denominators = den,
  keys = month,
  spc_settings = list(chart_type = "p"),
  line_settings = list(
    show_alt_target = TRUE,
    alt_target = 25,
    colour_alt_target = "#7B1500",
    plot_label_position_alt_target = "below",
    plot_label_show_alt_target = TRUE,
    plot_label_colour_alt_target = "#7B1500",
    plot_label_prefix_alt_target = "National Average: "
  )
)

Which has the following output:

It would be useful to have the labels generated last, so that they are placed on top of the lines and dots.